BRAKE CONTROL DEVICE FOR HYDRAULIC MOTOR

摘要

PROBLEM TO BE SOLVED: To suppress the increase of a brake release pressure after a brake is released through extremely simple constitution. SOLUTION: A control device comprises a break release pressure feed oil passage 40 to interconnect a drive pressure feed oil passage 36 to a hydraulic motor 2 and an oil chamber 28 to release a brake through an inlet orifice 42; a pilot valve 44 to normally close a part, situated downstream from the inlet orifice 42 through the force of a spring; a return oil passage connected to a spot situated downstream from the pilot valve 44 and connected to a tank T; and a delay orifice 44c formed at the pilot valve 44. A pressure reduction orifice 44d is formed at the pilot valve 44, the pressure reduction orifice 44d is positioned in such a manner to fully open a return oil passage 52 in the full stroke position of the pilot valve 44.